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Chin. Phys. B, 2011, Vol. 20(5): 050316    DOI: 10.1088/1674-1056/20/5/050316
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Macroscopic resonant tunneling in an rf-SQUID flux qubit

Cong Shan-Hua (丛山桦)aWang Yi-Wen (王轶文)b, Sun Guo-Zhu (孙国柱)a, Chen Jian (陈健)aYu Yang (于扬)b, Wu Pei-Heng (吴培亨)a
a Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China; b National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
Abstract  We have observed the macroscopic resonant tunneling of magnetic flux between macroscopically distinct quantum states in a superconducting flux qubit. The dependences of the macroscopic resonant tunneling on the barrier height of the potential well, the flux bias and the initial state are investigated. Detailed measurements of the tunneling rate as a function of the flux bias reveal the feature of the quantum noise in the superconducting flux qubit.
Keywords:  rf-SQUID      macroscopic resonant tunneling      quantum noise      flux qubit  
Received:  08 October 2010      Revised:  10 December 2010      Accepted manuscript online: 
PACS:  03.75.Lm (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)  
  85.25.Dq (Superconducting quantum interference devices (SQUIDs))  
  03.67.Lx (Quantum computation architectures and implementations)  
  42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)  
Fund: Project supported by the New Century Excellent Talents in University, China, the National Natural Science Foundation of China (Grant Nos. 11074114 and 10874074), and the National Basic Research Program of China (Grant No. 2011CBA00200).

Cite this article: 

Cong Shan-Hua (丛山桦), Wang Yi-Wen (王轶文), Sun Guo-Zhu (孙国柱), Chen Jian (陈健), Yu Yang (于扬), Wu Pei-Heng (吴培亨) Macroscopic resonant tunneling in an rf-SQUID flux qubit 2011 Chin. Phys. B 20 050316

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